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[src,scripts,egs] online-cmvn for online2 with chain models, (#3560)
* Add OnlineCMVN to Online NNET2 pipeline. This is used in some models (e.g. CVTE). This is optional and off by default. It applies CMVN before applying pitch. This code is essentially copied out of "online2/online-feature-pipeline.cc/h". Patch set provided by Levi Barnes. * online2: bugfix of config script, include ivector_period into the iextractor config file. * online-cmvn in online-nnet2-feature-pipeline, - update the C++ code from @luitjens, - introduced `OnlineFeatureInterface *nnet3_feature_` to explictly mark features that are passed to nnet3 model - added the transfer of OnlineCmvnState across utterances from same speaker - update the 'prepare_online_decoding.sh' to support online-cmvn - enabled OnlineCmvnStats transfer in training/decoding * OnlineNnet2FeaturePipeline, removing unused constructor, updating results
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